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I know its preference over performance but I'm so drawn to a dirty idle ;-)
the larger the engine; the more dirty idle you can get away with and still have decent low end TQ....that 7 degree overlap cam will thump awfully hard and and certainly want more stall than you're running in the 5.3
your heads flow really well and are balanced I/E ratio....the Titan III will peak just past 6K and be done by 6500.....perfect for a street ripper...